Download MAN-134 Optical Pendulum Readout

Optical Pendulum Readout
User Manual
Man 134
2.0.2
06/08/2014
C.Spalton
Andy Small
Chris
Rasmussen
Manual No.
Revision
Date
Originator
Checked
Authorised for
Issue
User Manual
1
Contents
Section 1 :
Forward ...................................................................................................................... 3
Section 2 :
Introduction ............................................................................................................... 3
Section 3 :
Equipment .................................................................................................................. 5
3.01
3.02
3.03
Operation ..................................................................................................................... 5
Maintenance ................................................................................................................. 6
Battery Replacement ..................................................................................................... 6
Figure 1 Optical Pendulum Readout.................................................................................................. 7
Figure 2 Use Thumbs to traverse scale unit ...................................................................................... 8
Appendix A.
User Manual
Manufacturers Notes For Digital Scale Unit ................................................................ 9
2
Section 1 : Forward
Soil Instruments Portable Readout is designed to read direct and inverted pendulum systems
supplied by Soil Instruments Ltd.
It is essential that the instrument covered by this manual is both operated and maintained by
competent and suitably qualified personnel.
Soil Instruments will not accept for repair under guarantee, instruments that have been neglected
or mishandled in any way.
User Manual
3
Section 2 : Introduction
The Optical Pendulum Readout is designed to read direct and inverted pendulum systems.
The readout comprises a manually focused telescope attached to a digital displacement measuring
scale, all mounted on a self-locating base. The unit must be used in conjunction with Soil
Instruments pendulum tables.
The range of the instrument is ±75mm with a repeatability of 0.05mm and a resolution of
0.001mm.
User Manual
4
Section 3 : Equipment
The telescope is fitted, at one end, with an eyepiece containing a crosshair graticule, at the other
end a fixed focus lens. A second lens is provided to increase the focal distance of the unit should
it be necessary.
Focusing is achieved by sliding the telescope through the mounting bush towards or away from
the pendulum wire until a sharp focus is achieved.
The measuring unit on which the telescope is mounted is moved along a slide by slight pressure
of the thumb. See figure 2. As the measuring unit moves along the slide the distance from the
origin is displayed digitally upon the screen of the measuring unit. The units of measurement are
either millimeters or inches. There are facilities to set the origin and, reset the zero when
required.
The measuring unit and telescope are mounted on a base plate that self-locates on the mounting
studs of the Soil Instrument’s Pendulum Tables.
3.01 Operation
The Optical Pendulum Readout comes with batteries fitted and should be ready for operation. To
check the unit is working, remove it from its carrying case and switch on the measuring unit
(See figure 1). The liquid crystal display should come on and display a reading (normally mm).
Check the units of measurement are those required, if not the units can be changed by pressing
the button marked in/mm. Move the digital measuring unit to the extreme left of the slide unit
until it comes up against the stop. Check that the reading is 0.00mm. If it is not, hold down the
button marked origin for more than one second then release it. The reading should now be
0.00mm. This procedure should only be necessary on first time use of the instrument or if the
battery is changed.
Mount the reading unit on one set of the self-locating studs of the pendulum table. If not already
done so, switch on the readout unit and move the telescope unit to the left until it comes up
against the stop. Checking the reading, if it does not display 0.00in/mm use the zero ABS
button to re-zero it. Move the telescope unit to the right until the pendulum wire is within the
field of view of the telescope. Focus sharply on the wire by sliding the telescope in or out of the
mounting bush.
Once the wire is in focus, align the vertical crosshair on one edge of the pendulum wire.
If the crosshair is not vertical rotate the eyepiece until it is so, if the telescope is fitted with
a 45° or 90° angle viewer it is only possible to align the crosshair vertically if the viewer is in the
vertical or horizontal plane. If the viewer is in any other plane the intersection of the crosshair
should be used as the sighting point. Note the reading on the display. Move the telescope until
the crosshair aligns on the opposite edge of the wire and note the second reading. The recorded
reading should be the mean (average) of these two readings.
For base or initial readings it is recommended that the above procedure is repeated three times,
the base reading being the average.
The above procedures are repeated for the second axis.
User Manual
5
3.02 Maintenance
It is essential that the equipment is kept clean at all times. The digital displacement measuring
device works on the principle of counting interference patterns on the top of the slide bar. If the
slide bar is dirty the measuring device will not work and an error message will appear on the
screen (see appendix 1). If the slide bar becomes dirty, clean it with a mild degreasing agent or
“WD40”.
3.03 Battery Replacement
Battery type SR44 Silver Oxide.
The battery life is better than 3 years under normal
circumstances. To replace the battery remove the battery cover by pushing in the direction of
the arrow (see Appendix 1). Remove the old battery and replace with the new one. Avoid
touching the surfaces of the battery faces as this reduces the battery life.
Note: It is necessary to reset the origin when the battery is replaced or the battery cover has
been removed.
For further information on the digital measuring unit see Appendix 1
User Manual
6
Figure 1 Optical Pendulum Readout
FIXED FOCUS LENS (OBJECTIVE)
x1
TELESCOPE
DIGITAL DISPLACEMENT
MEASURING SCALE
SET UNITS
BUTTON
RESET ORIGIN
BUTTON
DIGITAL DISPLAY
BATTERY COVER
ON/OFF BUTTON
SET ZERO BUTTON
EYE PIECE
DIGITAL MEASURING
UNIT
MOUNTING
BUSH
BASE PLATE
SELF LOCATING
STUDS
User Manual
7
Figure 2 Use Thumbs to traverse scale unit
User Manual
8
Appendix A. Manufacturers Notes for Digital Scale Unit



Always use an SR44 battery (silver oxide
cell).
Do not attempt to charge or disassemble the
battery. It may be short circuited.
If the scale unit will not be used for more
than three months, remove the battery from
the scale unit and store it properly.
Otherwise, leakage, if any, from the battery
may damage the scale unit.
(1) NOMENCLATURE
1
Beam
2
Main Switch
3
Battery compartment lid
4
Output connector
5
Display (LCD)
6
Power ON/OFF switch
7
ZERO/ABS switch (toggles between incremental and absolute measurement. See
8
ORIGIN switch (for setting origin)
9
Inch/mm switch (only for inch/mm model)
sec.(5)
10 Tapped hole for bracket (bored 2 places on the rear surface, but 4 places for scales with
Order no. 572-203/213-10)
11 Slider
User Manual
9
(2)
BATTERY INSTALLATION AND ORIGIN SETTING
IMPORTANT
Set up the origin of the scale after installing the battery. Otherwise, the error sign (“E” at the
least significant digit, LSD) may appear, resulting in incorrect measurements.
1) Installing the Battery
Remove the compartment lid and install the SR44 battery with its positive side facing up.
TIP:
Upon installation of the battery an arbitrary value or an E indicator will appear on the
display. Ignore this display. Continue origin setting
2) Setting up the Origin
After turning on the scale power switch, move the machine to its datum point then hold down
the scale ORINGIN switch for more than one second. The “0.00” display appears, indicating
Origin setting is complete. This origin will be retained even if the power is turned off.
(3) INCREMENTAL (INC) MODE AND ABSOLUTE
(ABS) MODE
The LCD will display measurements from the
origin when turned on (ABS mode). The display
can be zero set at any desired position by
pressing the ZERO/ABS switch. INC indicator
appears in the display (INC mode), permitting
measurement from the zero point. To restore
measurements from the origin, hold down the
ZERO/ABS switch for more than 2 seconds: INC
indicator disappears from the LCD (ABS mode)
while restoring the current position of the scale
unit.
(4)
ERROR SYMPTOMS AND REMEDIES
1) ErrC and display flickering: Appears when the scale surface is contaminated. The surface
of the scale should be cleaned and a small amount of low viscosity oil should be applied to repel
water.
2) “E” at the LSD: Appears if the slider is moved at a high speed.
measurement results.
This does not affect
Note:
If “E” is displayed when the slider is not being moved, the calliper is in the same state as
that of ErrC. Use the ErrC remedy.
User Manual
10
3) “B” indicator: Appears when the battery voltage is low. Immediately replace the battery.
(See sec.(2).)
(5) SPECIFICATIONS
Resolution: 0.01mm or 0.01mm/.0005”
Repeatability: 0.01mm or 0.01mm/.0005”
Maximum response speed: Unlimited (Miscount will not result due to slider speed.)
Power supply: SR44 (Silver oxide cell) 1 piece
Battery life: 3.5 years under normal operation
Operating temperature: 00C to 400C
Storage temperature: -100C to 600C
Bell Lane, Uckfield, East Sussex
t: +44 (0) 1825 765044
e: [email protected]
TN22 1QL United Kingdom
f: +44 (0) 1825 744398
w: www.itmsoil.com
Soil Instruments Ltd. Registered in England. Number: 07960087. Registered Office: 5th Floor, 24 Old Bond Street, London, W1S 4AW
User Manual
11